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Borrowings - Maturity of Long-term Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
2016 $ 1,106,613  
2017 3,452,420  
2018 719,574  
2019 2,306,326  
2020 1,272,561  
Later years 1,796,364  
Long-term borrowings $ 10,653,858 $ 9,006,959